Former for air-chambers for dental plates.



No. 69|,092. Patented Ian. [4, I902.

L. ARNDT. v FORMER FOR AIR CHAMBERS FOR DENTAL PLATES.

(Application filed June 7, 1900.)

(No Model.)

WITNESSES:

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LOUIS ARNDT, OF JERSEY CITY, NEW JERSEY.

FORMER FOR AIR-CHAMBERS FOR DENTAL PLATES.

SPECIFICATION forming part of Letters Patent No. 691,092, dated January 14, 1902. Application filed June 7, 1900. Serial No. 19,387. (No model.)

To etZZ whom it may concern/.-

Be it known that I, LOUIS ARNDT, a citizen of the United States, and a resident of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and useful Improvement in Formers for Air-Chambers for Dental Plates, of which the following is a full, clear, and exact description.

The purpose of the invention is to provide means whereby offsets may be produced directly upon a dental. mold or cast of the m outh forthe purpose of producing air-chambers, horseshoe-chambers, and lateral chambers in a plate for artificial teeth, which chambers are also known as vacuum-chambers,sucdon-chambers, or central cavities, and the projections on the mold or cast are known as chamber-pieces.

A further purpose of the invention is to provide an article which is in the nature of a form capable of ready and convenient application to the main cast and manipulated by one hand, the form being of a flexible or pliable character and adapted to deposit upon the main cast an offset which will produce a vacuum-cavity in the plate when made, which deposited offset when applied becomes an integral portion of the main mold.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be-had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan viewof a mold or casting for an upper plate, illustrating the additional.

mold applied to the main casting for the purpose of forming a vacuum-chamber in the plate. when made. Fig. 2 is a longitudinal section through the mold or cast illustrated in Fig. 1 and through the form and the deposited material which is placed by the form on the main mold to form a vacuum-chamber in a plate. Fig. 3 illustrates bottom plan views of a series of forms of different shapes. Figs. 4, 5, and 6 represent, respectively, crosssections through the forms illustrated in Fig. 3. Fig. 7 is a bottom plan View of the form, illustrating a slight difference in the construction of the flange of the same. Fig. Sis a transverse section through the form illustrated in Fig. 7; and Fig. 9 is a transverse section through one of the forms, illustrating the application of a handle thereto.

In making plates for artificial teeth it is frequently necessary to have an air-chamber in the plate in order that said plate may be firmly held to the roof of the mouth by at mospheric pressure. At present the dentist produces these chambers or cavities by fixing metal pieces of desired shape to the cast molds or casts of the month by means of pins. I aim to dispense with these metal pieces and provide means for castingthe necessary offset directly upon the main mold or cast, the material of the offset being preferably the same as that of which the main mold or cast is made, and to accomplish such addition to the main cast or mold in an expeditious, effective, and thoroughly practical manner.

A represents a cast or mold of the upper or roof portion of a mouth, from which an upper plate for artificial teeth is to be made. This mold or casting A is provided with an integral central projection 10, which is adapted to form a vacuum-chamber in the plate formed from the casting or mold. This projection 10 may be of any desired shape andis produced on the cast or mold A by means of a form, which form may have any desired shape, a few of said forms being shown in Fig. 3. The application of the form is fully shown in Fig. 2. These forms B are usually made from pliable rubber and consist of an upper or body portion 11 and a marginal flange 12. These forms may be provided with a central pocket 13 in their upper or body surfaces, as shown in Figs. 4 and 9, and when so constructed a handle 15 is employed in connection with said form, which handle is provided with a knob 16 at its lower end, the said knob being adapted to enter the pocket 13 in the form and to be retained therein by frictional contact. The handle 15 facilitates the ready direction of the form to the portion of the main mold or casting A upon which the oifset 10 is to be formed; but, as shown in Fig. 5, the form 13 may be perfectly plain at the top or convex. As illustrated in Fig. 6, an integral finger-piece or handle 14 may be formed on the upper central portion of the form.

The flanges 12 of the form may be straight upon their inner faces, as illustrated in Figs. 4:, 5, and 6, or the said flanges may have their inner surfaces 17 outwardly beveled or inclined, as shown in Figs. 7 and 8, and this latter construction is preferable, as it enables the form to better free itself from the material it carries after such material has been set upon the main mold or cast.

In operation a form is upturned and filled with plaster suitably mixed or with any other suitable compound which is capable of speedily setting and becoming hard; When a form has been thus filled with the plastic material, it is placed in a suitable position upon the main mold or cast A through the medium of the handles la or 15 or through the medium-of the hands only when the form is plain, as shown in Fig. 5. Under all of the said constructions, however, the form can be placed in position by one hand and may be held in such position bya single finger of the same hand until the plastic material contained in the form has set and .united with the main mold or cast in such manner that the two casts are virtually integral. The form being of elastic or flexible material is, with its plastic contents, readily distorted when pressed in position, so as to adapt itself to the curved surface of the dental cast.

I do not limit myself to the construction of the form B from rubber only, as the said form may be made of any elastic flexible material or fabric that may answer for the purpose; nor, as stated, do I limit myself to a form of any size, design, shape, or thickness, as the dimensions and the shape of the form may be any of those that a dentist may require to attain results desired. Thus the forms maybe so made that an oifset may be produced upon the main mold or casting to produce a vacuum-chamber from the thickest to the thinnest gage.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A form for producing an offset on a dental cast, and consisting of a body portion and a marginal flange forming a chamber for the reception of a plastic material, the said body portion being provided with a central pocket in its upper surface, and a handle provided with a knob at its lower end adapted to enter the pocket in the form and to be retained therein by frictional contact, as set forth.

2. A flexible or elastic form for producing an offset upon a dental cast, the said form consisting of a body portion and a flange formin g a receptacle for a plastic material, the said receptacle being shaped to correspond with the desired offset, and a handle detachably connected with the body portion, for guiding the .form and exerting pressure to distort said form and plastic material, substantially as de scribed.

3. A flexible or elastic mold or form for producing an offset on a dental cast, the said mold consisting of a body portion and a flange forming a receptacle for a plastic material, the body portion of the mold being provided with a central pocket adapted to receive a handle.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LOUIS ARNDT.

Witnesses:

J. FRED. ACKER, JNo. M. RITTER. 

